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Finding the Fourth Proportional to 354.46, 489.28 and 299.49

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Solution

The fourth proportional to 354.46, 489.28 and 299.49 is: 413.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.46 : 489.28 = 299.49 : x
  2. Step 2: Convert to fraction form
    354.46/489.28 = 299.49/x
  3. Step 3: Cross multiply
    354.46x = 489.28 × 299.49
  4. Step 4: Simplify right side
    354.46x = 146,534.47
  5. Step 5: Solve for x
    x = 146,534.47/354.46
  6. Step 6: Final answer
    x = 413.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.